Figures from the Publishers Association Statistics Yearbook released on 23rd April show UK publishers experienced a 27% increase in digital sales over the two years to 2009 taking just over £150m in revenue last year.
Of the £150m, £5m came from general consumer titles, with nearly half of that from e-book downloads, while the majority - £130m - was generated by the academic and professional sector.
Fiction, general non-fiction and children's books saw the biggest increase, up three-fold on 2008.
Academic/professional rose by 22% and consumer reference by 22%, while school/ELT declined by 18%.
The launch of new e-readers and platforms look set to boost this in future years.
The Publishers Association Statistics Yearbook is released on 23rd April.